springboot 详解 (五）interceptor

package com.curiousby.cn.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.curiousby.cn.constants.Constants;
import com.curiousby.cn.one.entity.User;


public class LoginAuthInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
                             Object handler)
            throws Exception {  
        User user = (User)request.getSession().getAttribute(Constants.USER);
        if (null == user) {
            response.sendRedirect("/SpringBootWebDemo/web/static/forward");
            return false;
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                           ModelAndView modelAndView)
            throws Exception { 
        
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response,
                                Object handler, Exception ex)
            throws Exception { 
        
    }

  

}

package com.curiousby.cn.configurer;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import com.curiousby.cn.interceptor.LoginAuthInterceptor;


@Configuration
public class WebAppConfigurer extends WebMvcConfigurerAdapter {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginAuthInterceptor()).addPathPatterns("/web/**").excludePathPatterns("/web/static/**"); 
        super.addInterceptors(registry);
    }
    
    
    
    //优先级 ：META-INFO/resources > resources > static > public 
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/img/**").addResourceLocations("classpath:/img/");
        super.addResourceHandlers(registry);
    }
}

访问 http://localhost:8080/SpringBootWebDemo/web/users/7

 会自动重定向到

http://localhost:8080/SpringBootWebDemo/web/static/forword

拦截器中添加了SpringBootWebDemo 这是我的工程名

server.context-path=/SpringBootWebDemo

也许默认更好点